Automatic gas shut-off.



PATBNTED JUNE 16, 1 903.

' B. M. SHEETS.

TIIMIA'II GAS SHUT-OFF. urmouonnwn, una. 12, 1902.

I 2s1unTS -sHmT.1.

NO- MODEL.

PATENTED JUNE 16, 1903.

B. M. SHEETS. AUTOMATIC GAS SHUT-OFF.

APPLIoATIoN HLBD DBO. 12, 1902.

H0 MODEL.

Patented J' une 16, 1903.

PATENT OFFICE.

BRADY M. SHEETS, OF EUREKA, WEST VIRGINIA.

AUTOMATIC GAS SHUT-OFF.

SPECIFICATION forming' part-of Letters Patent No. 730,977, dated Jun@ 16, 1903.

Application filed December 12,1902. Serial No. 134,988. (No model.)

To all whom, it may concern,.-

Beit known that LBEADY M. SHEETs,a citizen of the United States, residing at Eureka, in the county of Pleasants, State of West Virginia, have invented certain new and useful Improvements in Automatic Gas Shut- Offs and I do hereby declare the following to be a full, clear, and exact description of the invention; such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to automatic shutoifs and it has forits object to provide ameehanisin which may be employed in connection with a gas-supply pipe and which when the pressure within the pipe drops below a predetermined point will be operated automatically to cut ofl the supply of gas, thus shutting oft the gas should a leak occur such as would permit the pressure to drop to the required degree.

A further object ofthe invention is to provide a construction which will be simple and.

reference indicate similar parts in both views,

Figure 1 is a view partlyin section and partly -in elevation and showing the present shut-o mechanism set for operation. Fig. 2 is a View similar to Fig. l and showing the positions of the parts of the mechanism when the latter has operated to shut oft the flow of gas.

Referring now to the drawings, there is shown a main 5, from which gas is supplied to a building and with which main is connected the casing 6, from which leads a cylinder 7, having a piston 8 therein, and which piston is adapted to be raised and heldin raised position by the pressure of gas in the cylinder as maintained by the pressure in the main 5: From the casing 6 leads a pipe 9 to a second casing 10, at a point above the valve- -seat 11 of the latter, and from which casing below the valve-seat leads the pipe 12,'Lhrough which the gas passes to its point or points of consumption. In connection with the seat 11 is employed an upwardly-opening valve 13, having a stem 14, which passes upwardly in the casing 10 and outwardly through the stuffing-box, at the upper end thereof, the outwardly-lying portion of the valve-stem having a notch 16 to receive the latch-lever 17, which is pivotally mounted upon a suitable support 18.

.Upon a support 19 is pivoted a lever 20, one end of which lies above the end of the lever 17 opposite to the stem 14, so that when the lever 20is rocked in one direction it will rock the lever 17 to engage it with the notch 16 of the valve-stem 14, said notch being in proper position for such engagement when the valve 13 is raised from its seat. By holding the lever 2O against return movement the lever 17 is held in a corresponding position in engagement with the notch 16 to hold the valve 13 raised from its seat. The piston 8 h-as a rod 2l,which is passed upwardly through the guides 22 and 23in the cylinder7 and the upper end of which rod projects above the cylinder for engagement with the adjacent end of the lever 20 to rock the latter, the upward movement of the piston 8 being limited by the stop 22 when the piston-rod has rocked the lever 2O to a position to hold the lever 17 inA position to engage the notch 16 when the valve 13 is raised from its seat, it being understood, however, that in practice the levers and the valve may be manipulated by hand and that, if desired, the piston-rod may be raised to position to support the lever 20 in its active position instead of waiting for the gas to move the piston and therewith the rod.

In the operation of this mechanism gas is admitted through the pipe 5 to the casings and cylinder, and the valve 13 is raised and set, as illustrated in Fig. 1 of the drawings, the gas-pressure holding the piston 8 in position, as will be understood. If, then, the pressure in the pipe 12 drops below a predetermined point, the gas will no longer support the piston 8 and the Weight which presses thereon, the pressure of gas in the cylinder 7 IOO struction shown may be made, and any suitable materials and proportions may be used for the various parts without departing from the spirit of the invention.

What is claimed is- In an automatic gas shut-ot?, the combination with a casing having a vertical tube at each end and a pipe connecting said tubes, ot a piston in one of the tubes above the pipe, a rodfor the piston extending over the top of the tube, a valve-seat in the other tube below the pipe, the last-named tube having its upper end closed, a valve above the valve-seat andadapted to engage the Valve-seat, a rod connected to the valve and extending upwardly through the top of the tube and having its outer end portion notched, an upright upon the casing, a latch-lever pivoted to the upright and adapted to engage the notch of the Valve-rod, a second upright upon the cas- A ing, a lever pivoted to the .second upright and disposed with one end upon the first-named lever at the opposite end from the valve-rod and with its other end upon the piston-rod, a gas-supply pipe connected with the tube for the piston at a point below the piston, and a delivery-pipe leading from the other tube at a point below the Valve-seat.

In testimony whereof I affix my signature in presence of two witnesses.

BRADY M. SHEETS.

Witnesses:

J. E. COCHRAN, L. D. CORNELL. 

